MCIMX503CVM8B datasheet(79/136 Pages) NXP

79 / 136 page

Electrical Characteristics

i.MX50 Applications Processors for Consumer Products, Rev. 7

Freescale Semiconductor

4.9.3.2

eMMC4.4 (Dual Data Rate) eSDHCv3 and uSDHC AC Timing

Figure 37 depicts the timing of eMMC4.4, and Table 55 lists the eMMC4.4 timing characteristics. Be

aware that only DAT0-7 is sampled on both edges of clock (not applicable to CMD).

Figure 37. eMMC4.4 Timing

eSDHC Output/Card Inputs CMD, DAT (Reference to CLK)

SD6

eSDHC Output Delay

tOD

–2

eSDHC Input/Card Outputs CMD, DAT (Reference to CLK)

SD7

eSDHC Input Setup Time

tISU

2.5

—

SD8

eSDHC Input Hold Time4

tIH

2.5

—

1 In low speed mode, card clock must be lower than 400 kHz, voltage ranges from 2.7 to 3.6 V.

2 In normal (full) speed mode for SD/SDIO card, clock frequency can be any value between 0–25 MHz. In high-speed mode,

clock frequency can be any value between 0–50 MHz.

3 In normal (full) speed mode for MMC card, clock frequency can be any value between 0–20 MHz. In high-speed mode, clock

frequency can be any value between 0–52 MHz.

4 To satisfy hold timing, the delay difference between clock input and cmd/data input must not exceed 2 ns.

Table 55. eMMC4.4 Interface Timing Specification

Parameter

Symbols

Min

Max

Unit

Card Input Clock

SD1

Clock Frequency (MMC Full Speed/High Speed)

fPP

052

MHz

eSDHC Output/Card Inputs CMD, DAT (Reference to CLK)

Table 54. SD/eMMC4.3 Interface Timing Specification (continued)

Parameter

Symbols

Min

Max

Unit

SD1

SD2

SD3

output from eSDHCv3 to card

DAT1

......

DAT7

DAT0

input from card to eSDHCv3

DAT1

......

DAT7

DAT0

SCK

SD4

SD2

......

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